By then AE 5.5 will have been out for over a year, so there is a good chance that a small upgrade will be out by then, however you can never really tell... premier was stuck at 4.1 forever. My question is... Why wait? Is there some feature that you are waiting for, something that id doesn't have that you need it to do? AE5.5 is by far the best yet. Now with its 3d capabilities you can do things easily that were never before possible under 4.x. If you need AE then get it now... you wont be disappointed. It sounds like you don't have a lot of experience with AE anyhow. I have been working with it for over 6 years now and still haven’t come close to mastering it. Buy now... learn as much as you can as fast as you can... buy the books... take classes... just use it, fiddle with its features, see what things do, that’s the best way to learn what a program like that can really do... then if and when an upgrade comes out, you may have gotten the hang of about .02% of its capabilities and can begin to appreciate what will come with its upgrade.
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Life’s not that short.... your just dead for so long!