A number of the less reliable football sites are today reporting that Ashton could be back this month. The sites all say that "Dean Ashton could be back for West Ham before March." The 'could' in this sentence seems to be based on this purported quote from Curbishley,
"The last time I saw Dean running he looked good and I hope he will be able to step up full training soon. He has had an injection to deal with scar tissue that was causing him a problem and it seems to have worked."
I can't find this quote on any of the more reliable sites and even if true makes no mention of Ashton being anywhere near ready to play. Even if he is ready to step up to full training soon it would presumably still take a number of weeks more for Ashton to be match fit.