(Note: I did NOT steal the shield picture from AARoads, I just learned how to use lighting effects in the GIMP to replicate their effect.)
Shreveport Times: Louisiana route narrowed but cloudy
So, the announcement that Texas is going to use existing highways for IH 69 does kind of affect where it's going to run through Louisiana, or if it's going to run through the state at all. Right now, the strongest possibility is that it's going to run along US 59 in Texas, up to the junction with US 84 and US 96 in Teneha, and from there east to Logansport generally along US 84, running into Louisiana and angling northeast toward Arkansas along entirely new roads.
Another idea takes IH 69 from Teneha north along US 59 all the way to IH 30 near Texarkana, bypassing Louisiana entirely. In my opinion, this is the bad idea.
Some plans have the TTC (Trans-Texas Corridor) still in the works, just in a different form, using US 59 northward from Teneha as IH 69 takes the path to the east. I have no opinion on this, other than that IH 69 needs to come into Louisiana. Northern Louisiana badly needs the development another Interstate would bring.