Here is my list:
Double Fine Adventure - Linux support confirmed (pledge description).
Wasteland 2 - Linux support confirmed (pledge description, FAQ).
Faster Than Light - Linux support confirmed (pledge description).
Takedown - Linux & OS X support NOT confirmed yet (FAQ, forum thread).
Leisure Suit Larry - Linux support promised under condition (FAQ). Here I would to note some changes in FAQ - because they need to rewrite engine to support Linux (see comments). Look's strange.
Jane Jensen and Robert Holmes game studio - if I understand FAQ right then OS X support is confirmed, but Linux support NOT yet.
The Banner Saga - Linux support confirmed (FAQ, latest update).
Shadowrun Returns - refusing to support Linux (FAQ, latest update). Yes, even when they reach almost 200% of goal. Many angry Linux gamers in comment's. They promise explain this decision later.
Starlight Inception - Linux support confirmed (first update).
And thanks for Nekro - Linux support confirmed (project description).