My major wishful thinking is wrt the projects doing drivers. I'd love hardware support be not such a potential pitfall, both with basics such as graphics cards as well as peripherals like printers or graphics tablets not working as they should when you were unlucky with your pick, because you couldn't find any reviews telling you in advance whether any of the drivers work for hardware you can currently buy.

Also making graphics software better, like improving GIMP, because I often can't follow Photoshop tutorials. I don't mean that GIMP ought to be exactly like PS (I've never used that myself), but some basics I can't replicate. Many functions have equivalents even if the interface is different, but some things are missing that seem really useful from what I see in tutorials, like its adjustment layers. Also I guess the often lamented lack of CYMK and such, though personally I don't need such professional print-related capabilities. Also make it better work with tablets and brushes imitating natural media. The screenshots I've seen of Photoshop make that seem much nicer with options for brush dynamics and such, though the newest GIMP has made some progress.

Also having one of the other linux graphics programs that are truly geared towards digital painting actually mature would be nice. I have used the program that came with my tablet in a demo version under Wine (ArtRage, I think it was called), but having something like that natively would be nice.