From the Auspex codex breakdown, here's how GW scuffed the codex and made it immediately obsolete: 
Battleline:
- Hormagaunts from index/codex were 70/140 unchanged between the two, is now 65/130 from dataslate.
- Gargoyles had a points drop within the codex but were reverted back to their original index points values (75/150) from the dataslate.
- Tyranid warriors with melee bio-weapons increased in cost from index (90/180) to codex (95/190) but then were dropped to (85/170) from dataslate.

Other datasheets:
- Lictor saw its index points at 75, dropped to 70 in the codex, dropped further in the dataslate to 60.
- Von ryan's leapers were 75/150 in the index, dropped to 70/140 in the codex but then were reverted back to 75/150 through the dataslate.
- Genestealers were 90/180 in the index, increased to 95/190 in the codex but got a points drop to 85/170 in the dataslate.
- Zoans wwre unchanged between index to codex at 90/180 but got a point hike to 110/220 in the dataslate.
- Biovores went from 65/130/195 in the index to 45/90/135 in the codex but got a massive points increase to 75/150/225 in the dataslate.
- Barbgaunts went from 50/100 in the index to 55/110 in the codex but got another points increase to 60/120 in the dataslate.
- Ripper changes from the index to the codex saw the substantial change to paying for singular bases at 15/30/45 in the codex, they are now 20/40/60 in the dataslate.
- Haruspex went from 125 in the index to 120 in the codex but went back to 125 in the dataslate.
- Trygon went from 180 in the index to 170 in the codex, back to 170 in the dataslate.
- Mawloc same deal, from 145 in the index, to 135 in the codex but back to 145 in the dataslate.
- Maleceptor went from 165 in the index to 160 in the codex but increased to 170 in the dataslate.
- Toxiecrene went unchanged in points from index to codex at 200 but dropped to 180 in the dataslate.
- Screamer-Killer went from 180 in the index to 175 in the codex and was reduced fruther to 170 in the dataslate.
- Exocrine went from 135 in the index, to 125 in the codex but back up to 135 in the dataslate.
- THE MOST EGREGIOUS ONE OF ALL: The tyrannofex from 200 points in the index to 190 in the codex, increased substantially to 245 points in the dataslate.
- Harpy went from 230 pints in the index to 165 in the codex but up to 215 points in the dataslate.
- Hive Crone went from 200 points in the index to 190 points in the doex but returned back to 200 in the dataslate.
- Spore mines went from 50/100 in the index to 45/90 in the codex, but went to 55/110 in the dataslate.
- Mucolid Spores went from 45/90 in the index to 40/80 in the codex but increased to 50/100 in the dataslate.
- Sporocyst went from 145 points in the index, dropped to 125 in the codex but went back to 145 points in the dataslate.
- Tyrannocyte went from 105 points in the index to 95 points in the codex but back to 105 in the dataslate.

Characters/HQ's:
- Winged hive tyrant went from 195 in the index to 190 in the codex but increased to 210 in the dataslate.
- Hive Tyrant went from 220 in the index to 215 in the codex but increased to 235 in the dataslate.
- Swarmlord index/codex 250 points, is now 270 from dataslate.
- Parasite of mortrex went from 90 in the index to 75 in the codex but increased in points to 80 in the dataslate.
- Deathleaper went from 80 in the index to 75 in the codex, dropping further to 70 points in the dataslate.