I've seen various questions in the past asking about Kenya Airways 'Premier World' business class, so I thought I'd post some updated information here. (This is from some recent short/medium-haul flights, and long-haul flights longer ago, so other people may have more to add regarding long-haul).

Seating Configuration
Embraer E170
2+2 seating (similar to Economy, but slightly more legroom)

Embraer 190
1+2 seating (much more spacious than Economy)

Boeing 737 (300/700/800)
2+2 seating (‘armchair’ like – reasonable pitch and recline, but not lie-flat)

Boeing 767
2+1+2 (fully flat bed); (in the past, one or two of their older short-haul planes had the 737-type seats - but these have apparently now all been upgraded)

Boeing 777-200
2+3+2 (fully flat bed, with at-seat power)

SeatGuru seems to only show the 777-200, not KQ's other planes.

In-Flight Entertainment
I think that on each plane, the IFE is the same in Business as in Economy, namely:

E170:
Nothing

E190 (KYP, KYQ, KYR, KYS):
Touchscreen AVOD, with a modest selection of films and TV episodes

B737-300:
Nothing

B737-NG (KQE, KQF, KQG, KQH, KYB, KYC, KYD, KYE, KYF):
Overhead TV
(KQH is painted in SkyTeam colours)

B767:
KQX, KQY, KQZ:
PTV, with about 12 channels running concurrently

KQP, KQQ:
These are older short-haul planes, that in economy only have overhead TV (I vaguely recall that they give personal Digiplayers in J but I might be wrong...)

B777 (KQS, KQT, KQU, KYZ):
AVOD, with ~15-20 films

Contents Of Amenity Kit
Fabric case
Socks
Eye-mask
Pen
Toothbrush and toothpaste
Comb
Lip balm
Body lotion
Ear plugs

This doesn't seem to be given on short-haul flights, but is given on medium/long-haul (I'm not sure whether the distinction is made on aircraft type, or flight duration, or some other factor).

Passenger Information List
The following information is given on the FAs' Passenger Information List (on a short-haul flight; I haven't seen the long-haul one, so I don't know if it's the same or different):

Additional Information (presumably meaning additional information exists somewhere)
Skyteam Elite Plus
Corporate Elite Plus
Name Too Long (presumably means name is too long to be fully printed on the passenger list)
Corporate
Transit Passenger
Preferred Seat