A filing for 'TX550h+' with the United States Patent and Trademark Office (USPTO) could suggest an even higher spec hybridized version of the upcoming TX three-row is in the works.
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Back in early 2020, 'TX 500h' was filed and was the first time we learned Lexus had plans for a hybridized version of the TX three-row SUV. The "h" indicates a hybrid powertrain.

Now with a higher three-digit number and a "+", it has me thinking that Lexus is working on an even higher range and more upscale TX.

I'm just not clear yet on what will make it stand out from other Lexus models.