There is a schedule release for a TPU Gel case in October. Boxwave, Ebay - (DCmugen), (E-story) - Big TPU case sellers, will have these cases. Ebay there expected to be released right around the first week of October but that is only a estimate.
The pre model has been released for review and the colors that will be available are - Blue, Dark Gray, Black, Clear, Pink, Purple ( still being decided ), Orange ( still being decided ), Green ( this is under development ).