From the Gulden Development Team:

PoW²/SegSig
Today we will be releasing the final test builds to our testing group. This build is the complete package with only bug hunting and potential UI changes left to do.

Sonic
Sonic which will also be included in the 2.0 release has development and testing concluded. The results have been impressive with the average sync time dropping by +-65% on all setups compared to the current version.
We also picked up an issue with the sync when Windows Defender was enabled on all Windows operating systems which caused up to 3 times the sync period compared to Windows systems with it disabled, with Sonic this has been resolved, and on our tests this has reduced the syncs on those systems by +-85%. On some of our higher end test systems we are recording times of just over 13 minutes for a complete sync.

iOS
The new iOS wallet is in the final testing phase and scheduled to be released on the App Store in May.