Is it still a promo if its been released in an expansion?
i.e. dispell and minor heal?
Sure, why wouldn't it be? Gold stamp, different card number, different artwork (although the promo minor heal artwork has been used as a regular card I believe and the same artwork was used for Galador). The rarity of a card may mean something completely apart from the fact that the exact same card is readily available (see Summer Magic for MTG).
As an aside I greatly prefer the FFG method of Promos. They release either alternate artwork (full bleed) of already existing cards or counters/tokens. All stuff that is highly sought after, can be used, but gives no competitive edge.
It's worth noting that in the secondary market, the Mage Wars alternate art promos sell for more than just about any other Mage Wars promo released and a Mage Wars playmat just sold for $100 on eBay.