Apps and services do not need to be uninstalled before an OTA update.
Patches use AUPT, so nearly all of them you don't need to do anything for. I think a few don't fully follow the AUPT limitations and would need to be uninstalled before an OTA update. Do note,
all of my patches are fully AUPT-compatible and will not need to be uninstalled.
For themes, there are 2 categories:
- Regular themes: you'll need to uninstall these before any OTA update
- Clock themes: you do not need to uninstall theses. If, after the OTA update, the extra theme(s) aren't showing in the clock app, just install the Clock Theme Reinstaller package and the issue will be fixed. However, as clock themes are only 1.4.5-2.x, it's not a concern for the TouchPad anyway.
In addition to following @webosinternals, I recommend people also follow me at @JayCanuck, for info on my patches, WOSQI, and my other software.