I am thinking about getting both Principles of Freelancing and Project Management. However I am always thinking about whether a new edition is around the corner.
Anyone heard anything about these two titles? Should I just go ahead and get them?
Nope. But I wouldn’t know. You need to ask to SP Book support (link at http://www.sitepoint.com/books/) or, if you really want to contact someone from the forum, Raena. She’s the only one from the staff that has direct contact with SP HQ 
Although maybe Shayne would be better.