As yet
Definition 1 of 1
Pro Tip 1/3Temporal Context
Use 'as yet' to highlight that something hasn't happened before the current moment or a specific time mentioned. 
There's as yet no decision on the new policy.
Pro Tip 2/3Expectation of Change
'As yet' often implies that the situation may change in the future. 
As yet, we haven't seen any results, but we're hopeful.
Pro Tip 3/3Uncertainty Emphasis
Use 'as yet' to emphasize uncertainty or lack of information about something. 
The outcome is as yet unclear.