Test 4? Did I miss something? I understand you mean alpha 4, however it was included by Maidsafe as part of alpha 3: https://maidsafe.net/roadmap_dev.html
We should include here API for mobile platform too
Talking in terms of time or % completed is useless however is pretty clear that the implementation process is full of unexpected tasks as, for instance, data chains or disjoint groups plus the testing phase associated to it.
This can and surely will happen over and over again giving an outside outlook of stagnation.
That is what we have, no criticize here really.
There is only one way to move forward faster and it is hiring more devs. Maidsafe is putting a lot of effort here as well. But currently insufficient.
Summarizing, we are far far away yet but we will arrive for sure (we are in good hands 
)