This is a rarely updated, higher-level list of intent.
Section 6 of "10 years of Dear ImGui" has more details on some of those topics.

Viewport

• Improve Multi-Viewports feature toward merging in Master (~2.00) (#1542).

DPI

• Better DPI support (current solution is for user to load font + scale style according to DPI). (v1.92: #8465, #1676)

Navigation, Controls

• Improve gamepad and keyboard controls. (#787)
• Inputs: Promote ownership and routing system to public API.
• Shortcuts: Promote shortcut system to public API (+ finish proof-of-concept for shortcuts in hidden menus).
• Shortcuts: alt-style local shortcuts.
• Menus: once menus are able to handle their shortcuts (aka recursing in non-visible menus) we could envision Mac-style menu searching.

Docking

• Improve/rewrite Docking toward merging in v2.00. (#2109)

Text/Fonts

• Finish work on dynamic font and incremental atlas updates (v1.92: #8465).
• Incremental font atlas updates.
• Rewrite better text primitives.

Styling

• Improve styling support (easier to add more colors, basic inheritance system, cache float4->ImU32 conversions).
• Improve basic render primitives (allow for gradients, etc.).
• Optimize basic render primitives (e.g. using 8-way texture for curved shapes, borders, circles) to reduce CPU +vertices cost.

Bindings

• Improve dear_bindings to ease the generation of language bindings (e.g. C).

Automation, Tests

• Continued work on Dear ImGui Test Engine and Dear ImGui Test Suite.