A beta version of the new release of RAD Studio 10.4.2 (including Delphi 10.4.2) is being made available to update subscription customers. You'll need to sign up by tomorrow, and you'll later receive a following invite to sign the NDA and download the beta.
For details on the beta invite see the blog post by Sarina DuPont at https://blogs.embarcadero.com/delphi-and-cbuilder-10-4-2-beta-invite-for-update-subscription-customers/.
Meanwhile, David released a teaser image of the IDE for the coming version (https://twitter.com/cpp_delphi_dave/status/1336706124926619648?s=20). If you have a sharp eye, you can spot multiple new features.