I have a feeling some of the unannounced BB10 apps are being followed by RIM's @BlackBerryDev handle on twitter.
If you think this is plausible, add the twitter handle of who the dev account is following :)
The #BB10AppHunt continues :)
List:
@untappd- Untappd
@SoulVagrant - SERPRO Apps
Textgram @Textgram
AppFx @AppFx - iCost
Xamarin @xamarinhq
@satchmo
@miparUIDesigns