I'm not sure they have time.
Thorsten Heins delayed the launch twice (or three times) in order to get it right.
They had one shot on the launch. It wasn't a great launch. The web sites are going nuts because they took away the ability to sync to Outlook PM (replacing Desktop Manager with "BlackBerry Link"). A poor version of Zune.
Remember when the PlayBook came out? QNX. The dress rehearsal for BB10. It has minimal apps, and didn't have a native e-mail client for 9 months (it was promised in 3)...
Z10 = PlayBook redux...