First, hello every Warlocks on this forum, this is my first reply, i'm really happy about all the things i learn there.

I must apologize for my english, i'm a french dude, and i will do my best to write as well as possible, feel free to say when i do mistakes.

My first simple question is, when mobs are below 30% with Death Embrace 3/3, do you think it's the best choise to use SS, Improved Drain Soul or spam SB with my DoTs refresh ?

I've read lots of replies, for and against Drain Soul, and i'm a little lost, Soul Siphon isn't stronger than DS correct ?

What's kind of DPS should I be working towards on fights like Patchwerk in both 10-man and 25-man encounters? I'm currently hovering somewhere around 3500 with a standard Affliction build in 10-man Naxx but I've seen some WWS parses with locks hovering around 5k DPS.

edit: One more question, is it worth more for me to cast CoA in a 10-man raid or to cast CotE if I'm the only lock?

Thanks for this fast answer, that's exactly what i was asking.

In my mind i was in the case that the mob is full DoT and doing dps with SB, then i reach 30%, and to be honest i was wondering if i'd better canalise Soul Life or i rather Drain Soul for the best damages.

Do you see any big error in my template please ?

World of Warcraft Europe -> Info -> Démoniste -> Calculateur de talents de la bêta Wrath of the Lich King

Thanks a lot for your advises, and the fast answers.

You linked a french sample... I'll help on this one as I guess most of EJ users will have some headache trying to translate, (Edit: they still appear in english, nevermind).
Imp Drain Soul is not needed. It won't add to your DPS and is more a pexing talent. Threat should not be a problem nowadays.
Dark Pact: Life Tap is better.
Imp FelHunter: 1 point is enough so that it never goes OoM.
Grim Reach: 1 point? You don't have the equivalent in Destro... Try to get some other talent instead in my opinion.

For the rest... Some are still under mathematical modelization for comparison.

Not taking Imp DS doesn't prevent you to use it! Read the tool tip carefully, it just returns some mana when you kill the target and lower your threat...
Affliction relies now on Critics as well, feel free to use the spreadsheet to see how it affects your global DPS. The better gear you get and the more you crit, especially with the load of Intelligence you get now through itemization. So yes, Ruin is quiet sexy.

I really think it's too early to say what is the best Talent Tree, though we tend to have some better overview now.

Just one word to you Esfernum, "Merci".

I'm gonna perform some test with different templates according to your advises, see you soon, take care.

People are referring to the spreadsheet over and over, but I don't think it's close to accurate for WotLK yet. I've used both SimulationCraft and the spreadsheet with the same stats etc and have got vastly different results for rating equivalencies.

I'd have to agree here, take anything you get from the spreadsheet with a grain of salt. Among other things, the pet modeling is terrible. We're hardly at the "just check the spreadsheet" point we were in the last year or so of BC, and the class is also far more fluid and flexible than old school SB spam, making it far harder to do in an ideal manor. It's great that people are updating and continuing to maintain it, but it doesn't even have current gear in it, much less refined calculations. The sim was built from scratch with LK in mind and seems far more reliable. Either way, at this point most people's gear is more at the mercy of the RNG than anything else.

What are the latest opinions on best profession for a warlock in the WotLK world? Does tailoring/enchanting still have a significant advantage over the others?

Enchanting does, tailoring still has nice leg enchants, but not really worth keeping Tailoring atm (although I have yet to drop it). The reason being that you can still get the leg enchants and not be a tailor, they just require more mats. I'm debating JC though. Being a scribe gets you the best shoulder enchants in the game and lets you avoid the SoH rep grind. Alch is nice, but I cant really see Mixology working out to be that great over things like JC/LW/BS.

Was wondering if trinkets with the same on proc effect share a CD. Like the naxx 10 man with proc of +haste and the heroic healing trinket has haste on proc as well.Could I proc both of them differently or will one trigger the other. Also I am guessing the different proc ones like the crit and haste wouldn't share the same cooldown.