Web Forms: What's next and our plan for releasing

With Enketo it was possible to add onto the URL parameters to prefill a question.
For example, if:

&d[full_name]=dan%20joseph

is added onto the end of the URL then the question with name = full_name will be already filled with "dan joseph" when the forms loads.

  1. Is the above something prone to failure that I shouldn't use currently?
  2. Will a similar thing be possible in the new web forms?