An xlsReadWrite[Pro] successor (called xlReadWrite[Pro]) should have come in early 2012 but I got distracted by other hobby-projects and considering that there are alternatives (e.g. XLConnect) I was not ready to release my 'half-baked' attempt.

I cannot currently commit to a new firm release date. Things I was working on and things I attempt to support with the next version include:

• xlsx file format (in addition to .xls/BIFF8 format)
• support 64 bit
• support Mac OSX
• (support Linux (Debian), demands using FreePascal instead of Delphi)
  
• (pro version) much more capable API: formatting, merging, S3 objects (in addition), ...
  

Finishing all this takes time and 'release early and often' is, imho, not a good idea here.