The short version is this:
Speed has been tinkered with to make slower players more viable, but other issues have arisen making passing offense virtually non-existent. The punt block exploit, along with other speed-related issues that we've made rules against in this league, has been allegedly solved.
So you will only be able to effectively run the ball or throw short passes on offense in the new patch. Longer passes result in sacks or interceptions at a ridiculous and unplayable rate.
I am incredibly biased against this patch because in the current form you can both run and pass effectively, and while there are some game-breaking code exploits that get used, as soon as setherick and infinityontrial figure out the new ones we will be right back to where we are today with no passing.