I think on this particular occasion the #things bit is a joke.
Hash tags on Twitter are generally used as a way of categorising posts, so people can easily find your posts when searching for a specific topic.
For example, you might post something like
"Really looking forward to eating some weightless carrots on 11/11/11 #skyrim."
Then people searching Twitter for posts about Skyrim would find that post.
In Nick's case I think he was just being silly, and saying that the topic of his post was the extremely vague "things".
There is a slightly sardonic tone to Nick's tweet.
So let's be clear about this:
Bethesda has implemented a ruthlessly tightlipped policy on Skyrim, leaking information but in homeopathic dosages. It is clear they've chosen to do so in a precisely scheduled manner, of which the laconic fan interview was just an incremental step.
All this is understandable.
That said, Nick,
Deal with it.
You want people to stop naging about dumbing down the game?
Pove them wrong.
I think sardonic tweets are quite dispensable.