Yesterday's consultation document contained a revised "3R MasterPlan" drawing which, given its publication date, it would be reasonable to assume represents the most recent thinking about the R3 layout.
It's not a very hi-res image, but it's possible to discern the following differences between that and previous versions:
a) T6A is moved further north to be more or less opposite T5A
b) T6B and T6C satellites are merged into a single, long satellite and moved further east. That, in turn, reduces the length of the M25 tunnel, which now only goes under two E-W taxiways and R3, whereas previously it also went under two N-S taxiways as well
c) Two new parallel N-S taxiways to the west of T6A
d) Removal of the proposed A4 tunnel, the roundabout at Poyle and the link road to M25 J14
e) Appropriation of the area between R3 and the former A4, i.e. everything westward from the end of Blunts Avenue
f) A new road from the A3044 Holloway Lane/Harmondsworth Road junction, running along the northern edge of R3 to join the old A4 roughly halfway along the Colnbrook bypass.