I found myself asking this exact question at work this week after encountering an RJ45 connector with a somewhat different PCB-side pin-out than what I was expecting (I was expecting something along the lines of what the original poster suggests in their jack diagram).
Digging a little deeper, I found there are two common PCB-side pin-out configurations. This datasheet from TE Connectivity labels them as "traditional" and "Category 5":
Similarly, browsing through entries in the tables in this catalog document indicates a mix of pin-outs out there:
TE Connectivity modular jacks catalog
As other people have suggested, definitely check the datasheet for the specific part you intend to use. I realize this answer comes long after the original question was posted, but hopefully it helps someone else avoid the moment of excitement I experienced during a PCB layout review yesterday afternoon.