My thoughts, not rehashing the already mentioned predictions:
With the information about the shooting phase from today we might see more short ranged shooting aswell if there isn't a significant change to melee armies/units. Quiet a lot of units lose the "Lookout, Sir!" rule, which buffs shooting also.
The biggest impact will have the shortend board sides. Losing 12" means harsh buffs and nerfs.
We will be in hero and terrain auras more easily. Armies that rely on deepstrike and special setups have a harder time getting past screens (e.g. Nighthaunts, Summoning Demons, KO)
Spell ranges are buffed indirectly. Board wide effects have a marginal reduced effect.
If terrain changes to a style like 40k, movement will be much harder for huge blocks of units, leading to MSU lists.