I have been playing with OS 10.2.1.3175 since early last morning and I have to say I am impressed. This build is circulating with carriers and is now available for all to download. There is nothing hugely changed in this update but it is nice and stable and is very smooth. I am still waiting to see how battery life fares.
Check out the links for the leak thanks to Legend:
Z30 3140 radio
Q10-5 – 3140 radio
Z10 STL100-234 – 3140 radio