No, Intellect doesn't matter if you're going to level feral. The only time you'll be out of your forms is hopefully between pulls when you're healing yourself up. Even if you're low on mana starting the next pull, your mana will be regenerating during the fight so you have enough to heal yourself again after if necessary.
As you level feral, priority is agility to kill things faster (attack power/crit rating, Stamina (To stay alive), Attack power (self-explanatory), Crit (chance to get a 150% damage attack), Hit rating, expertise, Haste.
Make sure your first glyph is the Glyph of maul(nice for bear if you accidentally pull more than one), then at 20 when you get kitty, switch to glyph of claw(for the lesser energy cost). At 50 you get Mangle with is an "Everlasting ******" of fun. Don't worry about anything except stacking as much agility and stamina as you can as you level.
Any further questions can be answered in the sticky. Good luck.