Viz Media will release the first volume of Rurouni Kenshin: Restoration (aka, Cinema-ban edition) in English on June 4th, 2013.
Source: Viz Media website
I think Glénat will also release it in Europe. I remember reading about it a few months ago, but can't find a source now. To be confirmed, then...
EDIT: tokyo_pt says you can also preorder volumes 1 and 2 from Amazon UK (here and here) and from Amazon FR (also in English, here and here). lonegamer78 also found them on Amazon US. Volume 1 is listed at $5.92, run for it! And while we're at it, volume 1 (but not volume 2) is also available on Amazon CA.