The next (final) release of MP will most likely support DVB subtitles.
Currently it looks like this won't come in near future. Of course unless someone else will start to work on it. The core team is not working on MHEG or MHP integration for MP at the moment.What about UK subtitles which I believe are based on MHEG?
SweMart, what are you doing to the dog in your avatar?
Teletext subtitles is not related to the new TV engine yet, it's a kind of a bug that the background doesn't get transparent. But we didn't have time yet to look into it any further...