After a significant amount of silence on the Western front, casting news is coming for Phase 3, and it's going to include some surprises. Both rapper turned actor LL Cool J (who can actually act, as all fans of Deep Blue Sea will attest) and former Harry Potter Daniel Radcliffe have apparently been in talks about a super-role. Whether or not either will be for Ragnarok remains to be seen (Radcliffe's English accent would fit Asgard, though).
The Evidence
Well, this Tweet for a start... https://twitter.com/llcoolj/status/527292270324637696?ref_src=twsrc%5Etfw Right now LL's association with the MCU is broadly rumoured, but as long as he remains uncast, the unknown Marvel job can still be any of the upcoming late. Likewise for Radcliffe, who accidentally revealed in an interview that he had been in conversation with Marvel. Either of them could be set to be part of the next round of casting announcements, which will probably include news on Ragnarok, given that the director is about to be confirmed.