The new lower level Instant Adventures will certainly speed it up. Everyone talks about reaching level 45 to get IA's, and the last 5 levels being extremely fast. Having the lower options will I imagine do the same. I've recently made the push into the game to get through the leveling process and what they say about the game really showing its colors at 50 are true. Planar attunement, experts, chronicles, ember isle, zone events, dailies, there's so much to do as a fresh 50 that its almost overwhelming
. Definitely worth getting through those 50 levels. Without lower level IA's, my 1-50 was about 3 days /played which isn't too bad. I imagine that could be cut down a lot and undoubtedly will be even further by the new IA's in 1.9.