This won't be the year of Linux on the desktop, and this comes from someone fairly invested in Linux. XP user's will mostly upgrade to Windows 8.x (or seven if the jump to 8.x is too jarring), and those who can't upgrade to 7 will likely stay with XP indefinitely (people not running a PC capable of Windows 7 at this point are not likely concerned with the advances it offers).
At this point, Linux is definitely a better OS than XP from a fundamental perspective, but you can't train people away from the Windows ecosystem overnight.
As a bet, I'd say that there will be an increase in Linux user's this year, but it won't be enormous. The largest jump in Linux userbase will likely come from SteamOS if and when it lands.
To be honest though, I don't really care if there is ever a "year of Linux on the desktop". At this point, the phrase itself is mostly used sarcastically by Linux haters who grasp onto the phrase because they don't know what else to say. I, and most of the other Linux users I know, don't really care if Windows ever get's toppled. As long as I can continue to use Linux in my own way, that's great. If Linux does continue to build market share, even better, because more users leads to more vendor support which leads to a better overall experience.