Per Doug's blog;

While chatting with DeMar and Sonny yesterday, both told us they plan to play for the Raptors summer league team out in Vegas.
http://thestar.blogs.com/raptors/

Good to hear from the youngers guys. Doug also talks about how great it is to see 5 Raptors in.. getting in some work.. and meeting with the coaches so early! (one being Amir, which hopefully means he plans on returning).