I am curious without a strong need for Stealth Technology what fighters will look like...
I imagine with far superior engine technology they can go significantly faster.
Not hypersonic, as though a fighter sized hypersonic glider is possible, at that point it isn't exactly as fighter. Though some sources do claim in the sixth generation some fighters will have an element of Hypersonic flight.
I think the Mach 3-4 range is certainly possible in terms of how engines have progressed TTL. Also it seems without the need for stealth given the reasons calbear explained, it would be useful to have a speedy fighter be able to strike and penetrate enemy positions prior to any retaliation.
Actually the ATF competition OTL's initial RFI designs didn't feature much stealth, yet the designs speak for themselves. The lockheed design that is 115 doesn't even look much like a traditional fighter, and looks more like a SR 72 designed to quickly strike positions and penetrate enemy air. The other designs I think are also interesting, such as co op fighter or Missileer, which could serve as more of a dog fighter.
Considering the greater emphasis probably on urban combat, with the A4's speedy foreign interventions generally reaching say, a belligerent nations capital and quickly neutralizing anti democratic elements, I could see Exoskeleton armor in use, both for extra protective qualities and the ability to assist in strength, especially in terms of busting doors.
Actually assuming the A4 would have these capabilities, it is a curious question to wonder whether India has tech to rival. I mean given its excessive investment in Naval and Submarine exploration and colonization, here is a page on future sub tech based on the royal navy's study OTL.
Concept designs for submarines of the 2060s have been revealed by Britain's Royal Navy.
www.futuretimeline.net
I am curious how non nuclear warfare looks like in TTL. Wonder how overall well versed my take on it is.