Based on the mock-up at the showroom, the JK4 entrance is an elevated stretch of the road.
And the salesperson has an APDL dated 22/1/18.

Can anyone confirm that copper pipes for A/C is only installed for living room, master bedroom, and bedroom 2.

What about centralized heating? Are there space and pipe allocated for it?

I was told by the agent that you have 45 days to get your SPA signed.
This of course includes getting a loan approved.
Any extra time would require a letter of extension.

Yes there are people who have signed the SPA.

The news is Jalan Kiara 4 will be extended to Inspirasi and even the development signage states so.
However, no one knows for sure if the roads will be upgraded.
But I believe that it's just a matter of time before it happens.

My sentiments are similar to yours. Eventually the JK 4 will be built, it's just a matter of time.
For me, I'm looking at the long term, so when the road is build would not affect my plans.
Having JK4 is a catalyst for capital appreciation (also a selling point by SA) and also an added convenience.