9to5mac is reporting that Apple has added new iPhone 4s codenamed N90A and new iPod touch models codenamed N81A to their inventory system. Mark Gurman wrote on 9to5mac:

Three new iPod touch models have appeared in the system with the codename N81A. N81 is the codename for the fourth-generation black iPod touch, so the A likely represents the string of the three new white models.

Even more interesting are the two new iPhone SKUs that have showed up in the system. The catch is that these two SKUs are actually marked as tweaked iPhone 4s. The new device’s codename is N90A and this represents very minor changes from the iPhone 4 – which is the N90. In fact, this may be an iPhone 4 – an 8GB version as previously rumored. It is very possible that the two SKUs mean black and white models, but that is unconfirmed.

This news indicates that iPod touch won’t get any update except the white color and will have same 8GB, 32GB and 64GB capacities. And the current iPhone 4 will be available in 8GB model along side the upcoming iPhone 4S/5, like the 8GB iPhone 3GS is now available along with iPhone 4.