Macworld With Apple’s late-spring event just over a week away, a widely respected leaker has claimed that the company is about to announce a shocking upgrade for the iPad Pro. Up until now, the received wisdom has been that we’ll hear about relatively pedestrian upgrades to two iPad lines, the Air and the Pro, with the former getting a bump from the M1 to the M2 processor and the latter stepping up from M2 to M3. But according to Bloomberg reporter Mark Gurman, the Pro is likely to skip a generation and go straight to the as-yet-unreleased M4. “I’m hearing there is a strong possibility that th…