From Quim's twitter feed ...
"Ogg lovers: Maemo 5 comes with Speex. Vorbis/Theora can be developed by the community as one-click install http://bit.ly/nFWKs"

Isn't Speex the text to voice engine ? So it is integrated with all text based apps or just a standalone engine which has to be called from any text based app ? How would it work ? Am curious .