Below you'll find a good overview article as well as several blog entries that describe the features of the new Informix 11.70 release in more detail:

• Informix 11.7: The Beginning of the Next Decade of IBM Informix
• Panther released !
• Informix v11.70 - The cat is out of its cage!!
• Panther's Warehousing Features - Part I

And IBM marketing seems to have been active as well and created this "appealing and informative" :-) microsite about the new Informix Flexible Grid:

Informix Flexible Grid

I guess it will be daily updated like the many other Informix websites of IBM :-)