Testnet will restart on saturday.
Misc consensus fixes for corner cases (which involved changing some commands' format).
And various minor game ease of use tweaks.
All progress will be cleared, including coins mined.
If you want to carry a building over, you need to export it prior to updating to 0.29, then import it afterwards.
Do not use 0.29 before saturday when the chain restarts, it will not work. After saturday, do not use 0.28 anymore.