When will an error-corrected version of Traveller be available?
If, by an ‘error-corrected version of Traveller’, you mean a revision of T4, it looks like there won’t be. The next rules release of Traveller is being referred to in discussion on the TML as ‘T5’, and will be a significant overhaul – more than can justify calling it ‘error-correction’, although it is expected to be broadly compatible with the systems outlined in Classic Traveller, MegaTraveller, and T4. T5 will not be released until both (a) Marc Miller is satisfied with the product, and (b) a licensee is found – both hopefully to occur in the near future.