True, but look at the MTA's design language over the last 23 years or so. All the recent car orders from 1999-2000 onwards (until the R211s) were modeled after the most recent previous car order. For the IRT, it was the R142 that lead to the R188 (although in that case, the R188 cars were more or less the equivalent of a DLC expansion pack for the R142/As). Meanwhile, the R143s were followed by the R160s and more recently, the R179s. With this in might, I would not be surpised if the R268s turnout to be damn near identical to the R211s.