The current Minecraft Preview logo that it is using is the old logo, when the current logo is now updated. The new logo can be seen in the FAQ page, but it hasn't been updated in-game.
MCPE-152064
Minecraft Preview logo is using the old one, as opposed of the new one
Resolved
Cannot Reproduce
10
(Unassigned)
752818
Confirmed
Multiple
1.19.0.35 Preview, 1.19.0.27 Preview, 1.19.0.26 Beta, 1.19.0.21 Preview, 1.18.30.27 Preview, ..., 1.18.20.28 Preview, 1.18.20.26 Preview, 1.18.20.24 Preview, 1.18.30.21 Preview, 1.19.30.20 Preview
Retrieved
I totally agree that it should be updated. It bothers me when I am used to the one on main bedrock edition.