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Paul Redmond @paulredmond

PHP 8.4: Omitting Parentheses Around New Expressions

PHP 8.4 may omit parentheses around new expressions, allowing access to constants, properties & methods without extra parentheses. Voting ends May 24th.

The RFC for omitting parentheses around the new expression is likely coming to PHP 8.4. This RFC is currently in the voting phase, with 21 "yes" and 3 "no" votes. Voting ends May 24th, so there's still a chance the 2/3 vote could fail, but optimistically, it looks like it's heading in the right direction.
Since member access during instantiation was introduced, you must wrap the new MyClass() call in parentheses, or you'll get a parse error. The proposed syntax would allow you to access constants, properties, and methods without the extra parentheses:
class Request implements Psr\Http\Message\...