There will obviously be high resolution iOS and Android tablets, that shouldn't be surprising. The difference will be how does the software handle it? iOS developers will have two include two versions of their graphics for one aspect ratio, but how many will Android developers have to include, considering the many screen sizes and aspect ratios that will be available? There's going to be a lot more planning and testing required to develop for Android devices, or the apps that don't adjust for every configuration will look bad and work poorly.
What matters is aspect ratio. If the aspect ratio is the same it really is a non issue.
I think it is funny that people seem to think iOS graphic and images have not been scale down. Chances are the original source file is much higher res and it gets scale down for iOS before it is loaded for the apps.
If they are vector graphic it is a non issue. Since many games run completely off vector based graphic a complete non issue.