Additional new features
There are many small but useful additions to Photoshop 2020. Constraining the aspect ratio to maintain layer proportions with Free Transform was introduced in Photoshop CC 2019 – previously, you had to hold the Shift key to do this; now you hold the Shift key to unconstrain transformations. But it was applied inconsistently, with Smart Objects still retaining the old behavior. That oversight has now been corrected, irrespective of layer type.
Creative Cloud plans now include access to all 17,000 Adobe fonts in what was previously known as the Typekit collection. The really good news is that you can still access all the fonts even if you only have the Photography plan, which includes just Photoshop and Lightroom. The Properties panel now also allows you to access stylistic sets from those fonts that support them, with plain English descriptions of the glyphs to be changed.
Smart Objects could previously be turned into regular layers only by opening the Smart Object in a new window and dragging all the layers into your document. There’s now a Convert to Layers button in the Properties Panel, which creates a new group containing all the layers that were in the Smart Object; you can choose whether to retain or discard Smart Filters and transformations that had been applied to it.
The Brush tool has also had a minor update, with the ability to use the arrow keys to rotate a brush tip as you paint with it. You can now also hold the Tilde key ~ to temporarily make the Brush tool into an Eraser.