@Booper:
One that is more consistent with the Global 2nd edition rule set? Ideally these games would be self-consistent with as many core rules the same as possible, but that build on the simpler versions.
Maybe there is one in the works, but likely will be a few years before it is released.
Need and want are two different things… do we “need” AA50 2ndEd? Not really… do we “want” AA50 2ndEd? Maybe…
As others have stated, since it’s really mostly just a rules difference, if you’re really wanting it that bad, by all means, house-rule it in… nothing can stop you but yourself… perhaps the biggest rules difference is AAA and perhaps some unit costs.
As for WotC and/or AH making the “official” release of AA50 2ndEd… I’d dare say you’ll become a very old hermit waiting for that to happen, especially since some 9 years after the release AA50, they came out with little more than a reprint (though I and others were glad for a reprint)… if they wanted to do a AA50 rules rewrite, they just missed the boat, and it’d probably be another 10 years or so before they were to get the itch to do it again (if ever).