i really "hate" to talk to my direct superior. And, I have decided to resign. Can I just email her to inform her and then cc. HR my superior's superior? And, then place the letter on her table? I know it is rather awkward and unprofessional. 

what about if my future employer want to buy out ?? what should I state in my resignation letter?

You are eligible for it, not necessary entitled to one. It is much to the prerogative of your boss and company whether they want to still give you bonus or not.

Most often, bosses and companies would take away whatever intended bonus for those who tendered or resigned before the payout period. What people often do is to request of a sign-on / guaranteed bonus from the new company who wants you to join before the payout to compensate for your 'losses' in this current role. Working in a bank? 

I can't remember off-hand, but any amount stated in the contract have to honored, so salary will still be payable. What most companies do is to prorate the salary.

But bonus comes with a caveat that is is to the discretion of the management, which is why they can decide to pull back any recommendations when you tender.

Hello. A question to ask. What if after tender resignation, initially agreed to serve 3 months notice. But serving half way, decided to ask for early release maybe let's say not wanting to serve the final month. Is this allowed? Does it also depends on company and boss?