Got to play a bit with the FT-891 few days ago. Nothing impressive, modest rig, very menu driven. The only semi-interesting thing about it is it's the smallest and lightest 100W HF radio ever made, marginally (857 is pretty close and it also has VHF/UHF). Price is expected to be around EUR ~600, with another 200 for the external FC-50 tuner.
Links:Short Yaesu FT-891 videoYaesu FT-891 Operating Manual
To answer the unspoken question, Yaesu didn't put VHF/UHF in this one because they want you to buy the FT-991 for that.