Well, it did not take long to learn the answer to my question. Yes, Ukraine will have an early election, as President Volodomyr Zelenskyy announced on 19 May in his inaugural address. And thus, no, the current electoral system will not be replaced just yet.
The election is expected to be in July, a scenario I already discussed in the earlier post.
In the context of all this, today (20 May) the Prime Minister, Volodymyr Groysman, announced his resignation.
There had been a report last week that a dissolution of the coalition in the assembly would prevent the new president from calling an early election (because it would buy the assembly time to attempt to find, under terms of the constitution, an alternative premier they can agree on). But evidently not.