let's see
GK110-400-A1: 7,08bn transistors on 561 sqmm die area ~ 12,6m trans/sqmm
Tahiti: 4,31bn transistors on 365 sqmm die area ~ 11,8m trans/sqmm
Hawaii: ~6bn transistors (?) on 424 sqmm die area ~ 14,15m trans/sqmm
So yes, if rumors are true, Hawaii is a massive jump in transistor density...