First off, to the grand news - with the fresh 2.12.338 beta, you will be able to finally star messages, and view them later on, which would be a godsend for those who are struggling to find something in their incoherent conversation threads. The way you highlight a message for later preview is to long-press on it, and then click on the star that appears above. The highlights will then appear in a dedicated Starred messages section to marvel at.
Next in line is document support and search for PDFs. DOCs and so on, as you can see in the screenshots below, and there are some other smaller novelties that are yet to be discovered, judging by the increase in the APK installation size, and the 380 files in it that have been modified. If you want to test drive the new WhatsApp 2.12.338 version for Android, hit the download link below, and install it on your device - as usual, bear in mind that this is still a beta that hasn't arrived at the Play Store, so there might still be some kinks left in it.
Thanks for the tip, Joe!