Is it going to be a ton? I can make it happen, but is it smart to do so? Maybe not Roth it?
401k/Ira's = Pay no taxes now, pay taxes when you withdraw. Roth 401k/Roth Ira = Pay Taxes now, withdraw tax free after 59.5 (But you can withdraw the principal at any time). Not sure on the exact details but my understanding is that if you want to roll a 401k into a roth IRA your taxable income jumps up alot...Only way it might make sense is if you plan on being unemployed that fiscal year.
Knowing nothing of your financial situation I would recommend rolling it into a regular IRA. No fee's, no additional taxes, better fund selection etc etc etc.
If you want the advantages of a Roth IRA just open one up and start contributing.
I have a Roth IRA(That I contribute to) and a regular IRA(old 401k I do not contribute to) with fidelity.
Next time I change jobs I will just roll my 401k into the regular IRA I already have, rinse repeat.