No news on other 88's, but the way the kit is engineered, and hints on the net, I would think they'd get their monies worth from the basic moulds, and release other versions. Apart from the wings, which could maybe be done by extension parts, the other areas for the A4, C etc would be fairly straightforward I would think.
If the Hunter is anything to go by, being released (so far) in two versions, I think we will see more versions of the 88 some time in the future.