News153: Add Bitcoin Core GUI #4 description

Author: dongcarl

_posts/en/newsletters/2021-06-16-newsletter.md

@@ -102,7 +102,13 @@ repo], [Hardware Wallet Interface (HWI)][hwi repo],
 [Bitcoin Improvement Proposals (BIPs)][bips repo], and [Lightning
 BOLTs][bolts repo].*
 
-- [Bitcoin Core GUI #4][] UI external signer support (e.g. hardware wallet) FIXME:dongcarl
+- [Bitcoin Core GUI #4][] adds initial support for using [Hardware Wallet
+  Interface (HWI)][topic hwi] external signers via the GUI. Once this feature is
+  finalized, users will be able to use their HWI-compatible hardware wallets
+  directly from the Bitcoin Core GUI.
+
+    {:.center}
+    ![Screenshot of HWI path configuration option](/img/posts/2021-06-gui-hwi.png)
 
 - [Bitcoin Core #21573][] updates the version of libsecp256k1 included
   in Bitcoin Core.  The most notable change is the use of the

_topics/en/hwi.md

@@ -52,6 +52,9 @@ optech_mentions:
   - title: "Bitcoin Core #16546 adds external signer interface compatible with HWI"
     url: /en/newsletters/2021/03/03/#bitcoin-core-16546
 
+  - title: "Bitcoin Core GUI #4 adds initial support for using HWI external signers via the GUI"
+    url: /en/newsletters/2021/06/16/#bitcoin-core-gui-4
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Partially-Signed Bitcoin Transactions (PSBTs)