The phrase "additional announcements" is correct and usable in written English.
It can be used when referring to extra information or updates that are being provided beyond what has already been shared.
Example: "Before we conclude the meeting, I would like to make some additional announcements regarding upcoming events."
Alternatives: "further announcements" or "supplementary announcements".
"I suspect that we may have additional announcements in the new year".
One person close to the company said that additional announcements of discontinued products could be expected in the next several months.
Mr. Santorum said he would make additional announcements "in the next week or two" about how he would be moving forward.
The latest job cuts — and the additional announcements likely to come in a cascading pattern as job losses through the economy cause demand to shrink further and thus lead to more layoffs mean more pain for states, as unemployment insurance claims rise and deplete state coffers.
Google promises they are not done yet and there will be additional announcements of other regions.
On this front, CardSpring plans to have additional announcements in the near future.
In an additional announcement that was oddly obscured within the availability announcement, HTC and Rogers announced that they will be pushing a software update to customers within three months which will enable GPS connectivity and Telenav navigation.
Coe's decision to give up that £100,000 pay cheque, as well as the additional announcement that his company CSM would not tender for work with either the IAAF or bidding cities during his presidency, looks certain to pave the way for a paid role as IAAF president.
… An additional announcement will be made as soon as the relevant AAAS governance bodies issue a final decision in this case".
"The additional announcement of £13.7m for the extension of the Wi-Fi network in Belfast is meanwhile an excellent technological enhancement for business users".
In an additional announcement Rightster said it has secured the rights to offer live and on demand Australian Football League games outside Australia and New Zealand.
