Unless any bugs pop up in 4.2.6 that absolutely require a new version, there isn't going to be a 4.2.7. The next version will likely be 4.3.0 (a series of betas in preparation for a 4.4).

This is what we have planned so far for 4.3 / 4.4:
- UPnP support
- Creative Commons support
- Improved firewall transfers.
- Improved startup times.
- Networked Java upgrade.
- Networked LimeWire upgrade.
- Improved XML support.
- Various GUI tweaks.
- Various code fixes / optimizations.
- New Windows installer.