so, that means nvidia will skip maxwell
No, just that Maxwell might be split over 28nm and 16nm. The first Maxwell parts are already available (the GM 107 based desktop
GTX 750/750 Ti, and 850M/860M mobile, and GM 108 based mobile 830M/840M).
Nvidia's performance segment boards (GTX 770/760) will be a little long in the tooth by the time the Christmas holiday season rolls around - especially when you consider that they are minor tweaks of a series that debuted in March 2012, so it makes sense to push out a replacement on a known/proven process. The Chinese New Year production shutdown means that if you don't get product out in Nov-Jan, then you're pretty much stuck until March.
It also makes sense (if you can afford it and have wafer allocation) to run the architecture at 28nm since it becomes a relatively low risk option to optically shrink the design for a smaller node while incorporating any revisions into the metal layers. The big GPU successor to GK 110 (Titan/GTX 780/K6000/K40) will certainly be made on the smaller 16nm FinFET process.