Update was last night and just added saving/loading of custom games, with Dreamhack this weekend they don't want to mess around with the game. Hopefully we get a big update next week, would love to see some of the Learn features added.
Heroes that are added don't get put into the CM pool for a week, so adding N'aix wouldn't really affect Dreamhack, that's if they only added N'aix and not any balance changes though.
Mana management, knowing which heroes to prioritize ult with, positioning yourself for damaging and healing the highest number of people, he's a really hard hero, a new person won't be able to maximize skill-less farming early in order to maintain mana when a fight occurs, they'll just blow it all on creep waves and constantly be useless when that gank from mid comes.
What if you could morph into a creep?
This is actually not as good as you'd think, once N'aix jumps into a creep it's so obvious which he's in by the creeps movement, and if it's not, the enemy team will just clear the entire creep wave, you'd just assume that this enemy / allied creep moving abnormally is an ulted Morphling.
I don't feel Pudge is that hard, you just need to know what the enemy is capable of doing, and not get over your head. You also need the popper balance of making sure you get XP and ganking.
Huh? Pudge is one of the hardest heroes to play effectively, he is entirely based on the players ability to hit a skill-shot, if you can't, you have to hope you get lucky that every rune is invisibility or haste so you can set-up your ult, a pudge that can't hit a hook is in fact a detriment to your team as he may hook allies that are about to kill someone etc.