Yes, thats the beta.

Marlin/Marlin.pde

 #include "watchdog.h"
 
 
-#define VERSION_STRING  "1.0.0 Alpha 1"
+#define VERSION_STRING  "1.0.0 Beta 1"
 
 
 

Marlin/planner.h

 block_t *plan_get_current_block();
 
 void check_axes_activity();
-uint8_t movesplanned();
+uint8_t movesplanned(); //return the nr of buffered moves
 
 extern unsigned long minsegmenttime;
 extern float max_feedrate[4]; // set the max speeds

README.md

 
 WARNING: 
 --------
-THIS IN A PROCESS OF HEAVY OVERWORKING.
-DO NOT USE THIS ON YOUR MACHINE UNTIL FURTHER NOTICE!!!
+THIS IS THE BETA 1 FOR MARLIN 1.0.0
 
 Quick Information
 ===================
 *   M205 -  advanced settings:  minimum travel speed S=while printing T=travel only,  B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk
 
 EEPROM:
+
 *   M500 - stores paramters in EEPROM
 *   M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).  
 *   M502 - reverts to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.