Well, it will be in steam after release. Also, eventually, developers didn't close the place where you can get it with lower price or with pre-order bonuses.
The place is in secret (just nobody knows about it), but the link for english version is here:
http://strings.ice-pick.com/project.php ... anguage=en
This preorder place would be closed when the game is out, which, maybe, happen quite soon.
Originally stated release time was late December, but then Valve time happened. And now we don't know the exact release date.
Also, the link I gave you contains some info and lore about IPL games and team. So, good luck and have fun!