Target date for the 1.7.6 release is late January/early February.
In addition to the bugfixes and changes already included in SVN, main priorities are to finally incorporate the charting (for Excel2007, that I've been working on for much of the last year); OOCalc, Gnumeric and Excel2003XML Writers; and a basic HTML reader;
as well as extending the supported statistical and financial functions; an improved OLE Writer for Excel5 that will support Workbook properties); and Cell Notes in Excel5. Optional use of PCLZip for those who encounter problems with PHP's ZipArchive is
already included in the appropriate Writers, and I want to try and get this included in the relevant Readers as well.
Target date for the 1.7.7 release is around April/May.
I'm planning to look at the Excel Database functions; a first pass at implementing Pivot tables; and extending Chart support to other readers/writers.