NOTHING is going to happen fast, the leadership team is likely going to spend the first 6 months “doing no harm”. As said below, focus on your goals - don’t let worrying about shit you can’t control distract you.
Now is the time to turn up the revenue heat. As everything merges, so will new leaders. Those at the top of the charts are going to get the first looks/conversations.
@Stringer my thoughts exactly. I would add that you should also try to understand the future management landscape. The sooner you figure it out the sooner you can build those relationships.
Keep your focus on your goals and don't get caught up in the distractions that come with M&A. There is bound to be redundancies and other business level decisions that might affect you, so make sure you can clearly communicate your value and your flexibility to learn new products/markets/systems. Doesn't hurt to refresh your resume either.
Don't stress about the changes when they start to occur. Wait 3 months and see what the new normal is (there may not be any since your company is doing the acquisition). Help bring some of your new teammates up to speed on your products and hopefully they can return the favor if you can now sell from their portfolio.
At my last company we acquired two during my tenure. Nothings going to happen to sales. Expect a few all hands and some grand plans for the future, then at the next SKO be ready to have a ton of products added to your toolset, a brand new go to market strategy, and potentially pricing change. Be ready to be intro'd to other sales reps from the acquired company too as sales is never fired during the acquisition process as they need people with product and sales acumen for all products.