Back in 2010, Bashiok (former Diablo Community Manager) posted the following:
We’re glad the changes in 1.13b are being well received. We don’t think we’ve hit every issue obviously, there are still quite a few, as well as feature requests, etc. that we hope to address in future patches.
But, 1.13b won’t be the final version of this patch. Work is already in progress and near completion on a 1.13c that addresses a few additional issues. This new version will require new patches to be generated and tested, but it won’t be making its way to the PTR as we don’t feel the changes warrant it.
We plan to give a one week warning before a Diablo II ladder reset, which will coincide with the release of 1.13. You’re not likely to hear any updates on release schedule before that one week warning.
I also want to impress upon everyone that 1.13 isn’t and never has been intended as a final patch for Diablo II. I realize with the long delays in getting it to PTR, and longer stretches of time inbetween patches that it seems like it’s necessary that 1.13 encompass everything because, well, there’s just no guarantee that anything will come after. Or in a timely fashion. But, there is a solid long term plan of action for future support of Diablo II. There’s obviously plenty of room for skepticism, and I can’t blame anyone for that. But even with that skepticism I hope that we can get the message across that we have no intention of stopping here.
Diablo 2 patch 1.14 will be released after the d2 patch 1.13 later this year, it should be the prepatch in Diablo lore before Diablo 3 release and should be very demonic.