Y'know, I'm going to do a half-about face here. Initial gameplay reaction and my guess as to which archetype Steve will fill (could be wrong here, but still):
Steve is very likely to be focused around stage control, farming and counter-zoning. Steve's normals are likely to be shortranged (as the pickaxe swing shows), but his ability to get blocks and items will define him. Especially since he apparently can get healing items - that further encourages the Steve player to set up shop, upgrade gear and just dominate the stage. Blocks will likely have some health, so once he's set up, he can buy more time to get that amazing gear and TNT blocks. Normal blocks do have a limited time until they break, as
Cutie Gwen noted, but they can still buy time. TNT blocks especially emphasize this, as the mere threat of it can make zoners think twice and have to reposition. Likewise, as
SharkLord noted, Steve is likely to have excellent edgeguarding if he gets an advantage first, since he can place the blocks at the edge or even above (depending on how Steve can actually place them) and manipulate opponents into really bad situations.
If one plays against Steve: one will want to deny him any space to farm / build up his stuff or get items as often as possible. Sounds straightforward enough to be obvious, but do you really want to be trapped in a house like the Pichu in the trailer? That's an amazing opportunity for a TNT block. Take up space, identify when to punish Steve (when he's landing from his glide or down-air, make him think it's safe to place blocks etc.) mind games etc.
One of Steve's most likely weaknesses is that he'll struggle against swordies before he can get upgraded gear because he seemingly lacks range to fight back up close. Rushdown characters like Joker might be another problem for him since they might be able to get the drop on Steve before he's properly able to set up shop.
Zoners like K. Rool, Snake and Min Min might struggle against Steve because they want to control space themselves...
and that Kannonball's / ARM is not going to do much if it hits one of Steve's bricks. Worst case scenario it'll give Steve even more time to farm.
We don't know his stats (weight, air speed etc.) so I'll hold off still on a full impression. But that's the gist of it.
Now that's interesting. Last I heard (IIRC) he was looking into the LoL leak. He hasn't said anything about that since AFAIK.
I'm gonna watch out for that, even if it turns out to be false (which it might).
Yes, Minecraft's huge in China, and the claim is 300 million Minecraft accounts there. Chinese reactions to the reveal seem to be decently big (100K+ in under 2 hours) and several commenters noted that Twitter's paralyzed. Another hot topic is that Microsoft got that second character - with one commenter even asking "Political Marriage?" (in reference to Nintendo's and Microsoft's recent partnership).
While the reaction isn't unanimously positive (one Chinese XC2 fan lamented that it's getting not a lot of love, and that was upvoted in the comments) the reaction was still mainly positive.