A 'Q' will be added to the ticker when it re-opens, trading as SUNEQ. It will continue to trade (at a fraction of the current price) until they decide what to do with them (cancel them altogether, etc)
The SUNE shares that you own now will be automatically be converted to SUNEQ (or some ticker with a Q).
If you still own SUNEQ shares when they emerge from Ch11, then those SUNEQ shares will be worthless. They will begin selling new shares with a new symbol. You will have plenty of time to sell your SUNEQ shares. If you own shares of SUNEQ, I suggest that you do not panic, especially when this drops below 20 cents or less.