As I’m sure you have already heard, QGIS 2.0 will come with a new Python API including many improvements and a generally more pythonic way of doing things. But of course that comes with a price: Old plugins (pre 2.0) won’t work anymore unless they are updated to the new version. Therefore all plugin developers are encouraged to take the time and update their plugins. An overview of changes and howto for updates is available on the QGIS wiki.
TimeManager for QGIS 2.0 will be available from day 1 of the new release. I’ve tested the usual work flows but don’t hesitate to let me know if you find any problems. The whole update process took two to three hours … sooo many signals to update … but all in all, it was far less painful than expected, thanks to everyone who contributed to the wiki update instructions!