No really, being a developer is not an exception from questions, the magic words are lack of time. What really changed in experimental?
Your "favorite" developer has joined the team, along with a spriter (SirusKing) and new 32x32 textures.
E-Net has been reworked and packets are totally removed.
MFE, MFSU, and all cables have been bumped up tier. The new Tier 2 EU Storage is the CESU. At the same time, the MFE and MFSU have been made more costly, but their capacity is increased to 10x.
There are two more Factorization-esque steps to ore processing, being ore washing (increases yield by a little), and thermal centrifuging (adding byproducts).
Nuclear mechanics have been slightly reworked, breeding is removed and there is a new fuel called MOX Fuel, which has an energy output that scales on heat. At the same time, the RTG has been added, generating up to 16 EU/t with 5 RTG pellets.
Refined Iron has been removed. Instead, Greg's plate system has been semi-adopted. Items now use plates to craft, which are made by smashing 1 ingot with a Forge Hammer (80 uses). Cables are made by cutting a plate with the Cutter (80 uses). From midgame onwards, you can use the metal former instead to make these. At the same time, other crafting recipes (e.g. Construction Foam) has been changed. Reinforced Stone is now made by spraying Iron Scaffold with Construction Foam. Many of them take use of the reworked canning machine.
A bottling plant has been added, it's like an electric Liquid Transposer I think.
The Mass Fabricator produces liquid UU now (the old UU is now a legacy item that acts like a super-amplifier). Raw materials (e.g. Stone, Dirt, not Nether Stars, not Pistons) can be scanned in a scanner and the pattern can be stored in a pattern storage, or transferred to a replicator. The replicator consumes liquid UU and EU to create the item. The production cost of UU is increased to 10x.
That's about all the changes I can think of for now, I'll edit any others that pop up later.
A few new upgrades that basically allow Thermal Expansion and GregTech style side-specific ejection.
EDIT 1 in green (by me).
EDIT 2 (by me also) is removed.
EDIT 3 in blue (by me again).
oi who took me colour ~ sirus
nobody
STOP IT ~SpwnX