Do Surface Pro2 has connected standby?? Like Ipad and Android tablets?
If not is it due to hardware restriction or due to Windows 8.1 restrictions?
If not is it due to hardware restriction or due to Windows 8.1 restrictions?
No it does not.
But it wakes up almost instantly, and boots up in less than 4sec.
Windows 8.1 Supports Connected Standby, but the wireless card in the Surface Pro 2 (and 1) does not support this features.
That is incorrect. And why would the 64-bit version of Windows not support it? If anything it would be the 32-bit version which is probably the last version of Windows to have a 32-bit version. That is if anything. The reality, both versions of Windows supports it. Including Windows 8 RT.
Connected Standby (Preliminary)
I've heard that about 64-bit Windows many times before, but I don't actually think it's true. The Vaio Duo supports Connected Standby despite being 64-bit.
The biggest problem for it on the Surface Pro is you need a TPM2.0 for it, and the Pro and Pro 2 have a TPM 1.2.
The Sony is the exception rather than the rule and that's because they are probably implementing their own solution. First time I've heard of the TPM requirement as well, but all evidence I've come across says its on Microsoft to add support for 64 bit CS to Windows for it to work.
Another article from anandtech AnandTech | Intel Details Atom Z2760: Clovertrail for Windows 8 Tablets
Anandtech is definitely one of the places I've heard that from, and it could very well be true. That being said, from everything I've looked into, there is nothing about it being x86-only in the Microsoft Hardware Certification Requirements. In fact there are several mentions of features that are required for Connected Standby that are for x86, ARM, and x64 devices. If it's x64 only, I'd expect there to actually be concrete information on that somewhere within Microsoft's own documents.
As for the TPM 2.0 thing, it's on page 205 of the aforementioned document.