One annual subscription gets you all the 12 issues from one calendar year, so yes, if you pay now, you get the issues from January'08 to June'08 immediately, and the rest of this years issues as they are released around the 1st of each month. There isn't much besides those 12 issues really. ProFantasy sometimes puts previews of upcoming functionality in the laboratory section, which can be interesting, but basicaly, it is just the 12 issues. Most of the annual issues are very interesting, and well worth the price though. Also note that you can still buy the 2007 annual as well. Buying that one will get you all the issues from 2007 in one handy download.
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http://sub.profantasy.com/2008/
Also note that you can still buy the 2007 annual as well. Buying that one will get you all the issues from 2007 in one handy download.