ok, I don't know if auto-builder is asleep, or just busy. but it's taking it's time...
In theory witter 0.1.1-1 is going into extras-devel

It contains reply_to support.
if a tweet is in reply to another, it will load the other and put it in small text beneath the time stamp. Unless the replied to tweet is from a private feed. For some reason even if you are authorised to see the original tweet, the API for getting a specific single tweet blocks access.

if you tap-hold on someone you can select reply_to which a) fills their username in the text entry field, and sets a flag with the tweet it. if you submit a tweet it will get marked as a reply to that selected tweet. if you change your mind, just deleting the username should do the trick.

there is a ReTweet option too...but it's not working, all it does is copy the tweet text to the text entry, at that point I realised that included all the formatting that I'd added to the tweet. so I need to think longer on this one

error notifications are now hildon 'notes' instead of dialogs

text entry is now hildon.Entry

buttons are now hildon buttons (but I've haven't done anything to work around styling not being applied right)

I'll probably keep this version in extras-devel for a while to sort a few more big things out. But I thought I'd let people know it's coming...assuming auto builder eventually does it's thing