Okay, so let's say I'd upgrade to 4.0 on the release date. Is there any chance I could get stuck there? I know that SHSH blobs only need to be backed up for 32/64GB 3rd gen but I have the 8GB 3rd gen, still with backed up blobs. So, should I be safe trying it out, or should I wait until I'm super sure I want 4.0 and can risk getting stuck there?????