Probably not
The only other picture I can find comes from [this website][1]this website, which has a BB-8 schematic showing its escape mode:
[![enter image description here][2]][2]
However, the schematic here appears identical to that on the shirt, and the source is uncertain.
The big questionMore relevant, though, is this: If this is BB-8's "escape" mode, why does the droid not use it during The Force Awakens when it needs to, well, escape?
[![enter image description here][3]][3]
This, I think, renders the possibility that this is BB-8's escape mode somewhat unlikely. [1]: http://lestoilesheroiques.fr/2015/09/star-wars-le-reveil-de-la-force-une-nouvelle-date-de-sortie-francaise.html [2]: https://i.sstatic.net/JHgeL.jpg [3]: Note that the T-shirt appeared https://i.sstatic.net/aD9zz.jpgsignificantly in advance of the movie, and thus BB-8's actions in the movie were still uncertain.