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Re:The TeX tuneup of 2014 [pdf] by _delirium on Sunday April 27, 2014 @03:08PM (#7656311)
I don't know of any complete rewrites, but there are some cleanup/extension efforts underway, which are increasingly displacing "classic" TeX. The pdfTeX / LuaTeX line is probably the most actively developed codebase. It's 100% C now (no more Pascal or WEB code), and supports modern things like UTF-8 input, the lack of which was one of the more frequent pain points of trying to use classic TeX today.
Re:The TeX tuneup of 2014 [pdf] by NotOscarWilde on Sunday April 27, 2014 @06:14PM (#7657183)
> and supports modern things like UTF-8 input

Speaking of plain TeX:

Yes, they support UTF-8; that is, support it with a command-line switch which is a bit tricky to use. It's not like TeX can detect the encoding of your file and set things up automatically.