The japanese version(original) of the Revel Robotech and similar Kits tend to be re-released on a fairly regular basis in Japan(every 1~2 yrs).
This of course does NOT include the old IMAI Kit since the Company went bust, not sure who and if anybody bought the licenses and moulds for those Kits.
If you have a contact in Japan ask them to keep an eye open at the 2nd-hand kit shops like (Magic Box and Mandarake), also a lot of those Kits (major Robots) are still available in their Resin version or similar.
Many other shops also stock older Kits that are still marked at the original or lower price.
Got a 1/48 Terquila Gunner, 1/48 Grabgunner, 1/72 Soltic H8 & 1/72 Dougran recently via a contact of mine.
As for re-issue of those kits on a wider scale international I somehow doubt it, as Revell would have to negotiate new licences with the licence holders in Japan.
Best Option would be to get hold of some of the re-issues and than look out for the rest on online auctions and similar.
As a side-note I heard a lot of the old Lazyner Kits been recently re-issued by Bandai.