Do we need another Paranoia rpg? Probably not but what's the harm. It gets new people interested in the game and after all Mongoose is a company. They need money to finance other games in their line.
I don't think anyone plays Paranoia by the rules and if they are they should be shot for being traitorous. Paranoia is the ultimate cure for metagaming. In a game where its best not to know. Rules aren't needed or if they are, they're used only to make your players more paranoid.
How many versions of Paranoia are there now? Three West End Games versions and two Mongoose editions? Actually, this would make three Mongoose editions. So, the latest would be the 6th Edition of Paranoia. Do we really need 6 editions of Paranoia? Really, do we? I'm asking this question as someone who came on board with the very first edition of the game and quickly realized the rules were worthless - it was all play and players. Seriously. Charts, rolls, weapons, powers - all paled compared to notes being passed back and forth and clones falling by the wayside.