Hello May,
No need to worry. The update that is coming on March 26, 2018 is going to be a relatively minor update. According to my sources this update will mostly be focused on updates to the lexicon. For example, the term 'sprint' will be phased out and replaced with 'iteration'. So our plan is to follow along and update the lexicon in the simulator as well.
However, if you visit the websites and read the marketing of some other providers you might think that the world is going to end on March 26th and that the exam is changing so much that you need to completely forget everything you ever heard about Agile and only their training will properly prepare you for the new exam. I find it quite misleading.
In about 10 days I will also be conducting a phone interview with PMI's program manager for the PMI-ACP exam in which we'll discuss exactly these topics. The interview will most likely be published later this month.
So in a nutshell: There will be a marginal update to the exam, which may require some marginal changes on our side. Nothing more.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC