If we are going to be gemming and reforging Mastery from crit
and haste, I'm going to have to be the first person to ask: Does mastery have a cap? I'm not in the beta to answer that question.
In light to our mastery talent, I can see how we could easily take advantage of the mastery system and push our chances for Lightning Overload to proc more than Blizzard would desire. Before we go crazy on reforging a lot to mastery, let's figure out where the cap is...if one does happen to exist.
I found this post on TotemSpot on the "Ask an Elemental beta tester" thread:

OK. I went back and did a few more tests last night.. There were so many people on the dummy that I had to travel around to find a boss dummy without outside buffs on it.
What I concluded was that with my gear, 42% crit, 1290 haste my avg dps over 4 sets of 5 minute tests was about 10.4k (no searing because apparently it attacks half the time and half the time it doesn't).
When I reforged all the crit to mastery, ended up with around 35% crit and 29% mastery. The average was about 11.5-7k over the same 4 sets of 5 minute tests.
I went back and reforged every single piece I had even with haste on it, and dropped to around 1059 haste, 35% crit, and 39% mastery. The first test I did was around 11.8k, the rest after didn't get above 10.5k so I'm guessing that's RNG to the extreme. Having less haste I'm sure didn't do much in the way of getting more flame shock ticks triggering more lava surge procs. It also felt like casting was sooo slow that it made the rotation pretty clunky. The average of those tests were around 10k on average, really spiky throughout the test tho.
Then I went back and did another set of tests with the haste on DFO and CTS restored so that brought my haste up to 1189, tests showed I was struggling to hit 10.7k.
So I definitely got better tests with only reforging my crit to mastery. Reforging the haste just seemed like way too much potential for RNG to really be a problem and damage was too spiky for my liking. When it was good RNG, tests were great, and better dps than any other combination, but when RNG wasn't on my side.. it was quite a bit worse by at least 1.5k.
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Since there was no difference in DPS between when the person had 1290 haste-35% crit-29% mastery and 1059 haste-35%crit-39% mastery, our mastery cap may be at 30%. On the other hand, it could be possible that since the person has 231 less haste when experimenting with 39% mastery that the 10% more mastery made up for the difference. However, the DPS produced with 1059 haste, 35% crit, and 39% mastery only produced DPS in the range of 11.5k once out of the four times tested. Meanwhile, the 1290 haste, 35% crit, and 29% mastery yielded DPS in the 11.5k all four times in the four times tested. Unless someone else has any other tests to introduce, this person happened to find out at which point does mastery stop contributing to our DPS - which is somewhere between 29% and 39%. Since the best results were yielded at 29%, the best place to take mastery up to and stop at is 30% since anything more taken away from reforging haste to mastery ends up hurting our DPS.