The ExtJS 4 migration has been dropped as sub-project of the TYPO3 4.7 development. See the accordant discussion and explanation here in the v4 list
The purpose of this project is to:
- convert the RTE to ExtJS 4.0
- develop new element browsers
- integrate the RTE with the upcoming DAM 2.0 (by means of new element browsers)
This project uses the GIT repository of the Incubator project and has its own branch "project-rtehtmlarea" in there.