Yes yes!
There'll indeed be a season 3!
1. The spirits say "See you soon." at the end of episode 13 in season 2 (just like high school of the dead)
2. Ichigo's relationship just started up
3. Ichigo is going to london
4. The internet said so
5. They had an incomplete ending for season 2.
Now that I've sated then the next question is 'When'?
1. You have to be patient.
2. It's only been about 2 years since season 2 ended.
3. They probably want more views til they further invest money into this. So, maybe get your friends to watch it too. Alright?
4. It actually takes quite some time to do this. Especially because of the high everyday chances that they might be outrun, voice actor will quit, ect.
5. You need to do a lot before something is even allowed in countries.
6. Translating it to all different languages.
7. Money. They need more money to get this. You have to use money to make money, but also gain more money then loss. But before that they need a lot of money.
8. It's pretty bad ass to do a whole new idea and everything in under 2 years.
9. Just making the thing itself is hard enough.
I could go on and on, but we'll stop here. So, son't get your panties in a twist and wait.