It is actually the same bullshit Gox bot that was identified a couple weeks ago. At least on Gox. People call it the "Willy" bot and is likely run by MtGox since it had trading access while everyone else was shut out of Gox for an hour+ last week. Most of this current rise on Gox is the Willy bot. Buys around 15btc every 7-10 minutes.
There is no indication that anybody is calling the bot "willy"
You should read and listen to more btc live casts, a lot of people are calling it willy. I think it was 'coined' a week or so ago on the live cast run by this guy bonavest.com - there was another name in the running too, but I forget that.