You will now be able to use 'payrent' to pay the back rent due as well as a 7.5% penalty. It also will not take corporate perks into consideration when calculating the rent due.
When your rent becomes past due, your apartment will be placed in 'evicted' state. You'll still be able to leave, but re-entering will require you to pay the back due rent first. After a grace period of time (14 days - this could vary between locations), the property left in the apartment will be sold or trashed by the landlord and the apartment will be put back on the market for new renters.
GMs are no longer required in this process, but you no longer get the RP of the grumpy landlord either. A bit of a trade off some will miss. If I've overlooked something with this change, let me know.