There is little activity because MIUI China is soooo slow in updating base roms. For example SGS2 is still on an old 4.0.3 base while it has been updated to 4.0.4 more than six months ago and SGS3 has been updated to Jelly Bean more than a month and it's still on ICS. Only these two models have...
Still a five months old rom base for SGS2 and official Jelly Bean will come late November. So maybe i will come back here in 2013 to see if any updates have been made on the most popular android device.
Apart the fixes that Android 4.04 OS brings there are hundred of fixes in the ROM base by Samsung, newer kernel with fixes, newer radios etc. ZSLPG which is being used as a base in MIUI is 5 months old, you can imagine the amount of changes in ROM, modem and kernel level all this months.
It seems to work but some things like the names of days and months are not translated, im getting Monday and August on lock screen and some widgets like Beautiful Widgets also some options are in Russian.