The plan was to carry over the fundamental gameplay and trademark sense of humour from Banjo-Kazooie, and make everything ... Not to mention playable Mumbo. Oh yes, playable Mumbo.
Dear old Mumbo can even turn Banjo into tried and true Zelda items like a bomb this time around, which as Kazooie is quick to note, is "probably just another cheap reskin with no new abilities." ...