Slow himself has said it a couple of times, on youtube interviews as well as his stream. On top of the Mindcrack pack that is out now the Direwolf20 pack should be out tonight, and there will be more coming. Ultimate he just said on his stream will be a couple of days as all the mods update, but they are coming.Where did they say that? As of today 2h ago, the news is that if everything goes well they will release one pack (no information on the content) at Christmas and by seeing how many times they announced a release when it was not true because of various problems I don't think "everything will go well". The last news on the website is from the 19 and twitter is full of links to some obscure german advertising website.
If it is an unofficial port then FTB will not be using it. (this is the case with all mods as well)actually there is a semi valid version for Inventory Tweaks. It's working for me.
If you are speaking about the Ultimate pack then it's cause there maybe more mods getting added to that pack that are not listed on the doc and probably not updated. If you are speaking about pack A you can play Mindcrack/Direwolf's Mod packs that have almost the same mods as pack A.Checking all of the mods by hand, using Google, I find that all of them are now up to date for 1.4.6 except Equivalent Exchange 3 and Inventory Tweaks.
Given this fact, what remains before FTB can officially be released as a mod pack for 1.4.6?