Do we know how the to hit chance is calculated?

In eve it was based on transversials ... velosity ... the size of the weapon and the signiture of the target.

But speed and transversial dont seem to be in perpetuum. Dispersal, and surface hit radius seem to replace weapon size and sig.

But in EVE speed was a major defence for small ships ... so do we know how light bots will be able to avoid incoming fire from much larger mechs? Will the light robots remain effective later in the game? Or will we have to trade up for ever larger and larger mechs?

Seamus (Rik)