I wouldn’t bet my pants on getting a Linux client for NS2, but I already ordered it at the first possibility in the hope of getting one and I still hope that the guys will port it. It’s likely that they’ll do it, but not 100% certain.

I like yourself though this way, that’s why I haven’t bought yet Torchlight or Venetica.
But this is for this pack I want to try a different approach, let me explain…

Overgrowth will already have a GNU/Linux client, so you already get what you pay for.
NS2 is mostly cross platform as their engine, there is a huge thread about people asking for a native GNU/Linux client in their forums : http://www.unknownworlds.com/ns2/forums/index.php?showtopic=104522 , in which the developers confirmed that it’s very possible.

In most times we the GNU/Linux gamers buy games that already have a GNU/Linux client, on other times we preorder s specific amount of games so they develop a GNU/Linux client (like it happens with most Deck13 games).
This time I propose to preorder (Overgrowth alone worth 90% of the price), and post in their forums that you have already preordered and you are a GNU/Linux user – you have supported them in their darkest hour when they had no money to continue the development , and in turn you want them to support you.

I think it will work as there is no reason why it won’t.

Also as you see Comprox, one of the NS2 developers has posted on LGN blog, so it’s a good sign.

I don’t see the logic there, they aren’t going to know that you’ve preordered in the hope of getting a Linux version. I won’t be buying NS2 unless a Linux client is confirmed.