Nope, not money grabbing, just giving the non-retina Air its final upgrade before the new retina model is released.
This is exactly how they introduced the retina MBP. They updated the non-retinas with minor spec bumps to the latest versions of the components used in that generation of products, and then released the new completely redesigned model with the next gen components inside. Why, you ask? Because the non-retinas will probably continue to be sold alongside the new redesigned retina model for at least 1 year, maybe even two, as has been the case with the non-retina 13" MBP.
It's not a money grab because it will most likely be a completely silent upgrade.
I am very excited to see whether they announce the new retina Air at WWDC or not. It will either be Broadwell or ARM, and won't necessarily be released at announcement, but could be announced at WWDC and released later in the year. I'm betting it will be Broadwell, but wouldn't rule out ARM quite yet, they could drop a bombshell on us, who knows!!