For ISIF will there be rules for moving existing factories & making new factories? Or will this be done at GM level?
It's called Inner Sphere at War (ISW) now.
And the ISW rules as of the IO Beta don't contain rules for moving existing factories. They do contain rules for upgrading worlds from "other" (no factories) to "minor industrial" (1-2 factories), then to "major industrial" (3-7 factories).
CORRECTION - there's no way to go from "major industrial" to "hyper industrial", so no more Coventries or Luthiens than the game starts with. Rules are on p351 of the IO Beta.
The Inner Sphere hasn't displayed any real "factory movement" capability in fiction. The Clans have, but the Clans are not in scope of the current Beta rules. This won't be forever, and this may be covered in future Clan expansions. Similarly, the current ruleset doesn't contain rules for Intelligence Operations, Communications or Interdictions, Research, or WarShips; that's not to say such rules won't eventually be released down the track.
W.
updated to correct small error.